SOIL-PILE-STRUCTURE INTERACTION ANALYSIS ON LIQUEFIED SATURATED LOOSE SAND

• Main Author: Krisnadi Arianata, Maximillian
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/47972
• Institution: Institut Teknologi Bandung

Under dynamic/seismic (earthquake) loading, a complex interaction phenomenon between soil, piles, and structures occur, this phenomenon called as soil-pile-structure interaction. This interaction can be divided into two (2) types, the first one called as kinematic interaction which is caused by soil deformation, and the second one called as inertial interaction that occur due to superstructure responses to earthquake. The performance of pile foundations during an earthquake significantly influences the integrity of structures supported by them. Therefore, in seismic design process, modeling of the soil-pile-structure interaction is an essential part, especially when liquefaction occur. During strong ground shaking, liquefaction results in complete loss of strength and stiffness in the liquefied soil and consequent large ground deformation. Numerical analysis with finite difference approach used to model the behaviour of liquified soil and interaction between soil-pile-structure. Finn-Byrne model, which is a loosely coupled effective stress constitutive model employed to model the behaviour of liquified soil. In addition, hysteretic model by Darendeli is combined to model the non-linearity behaviour of soil due to dynamic loading. As a comparison, a case with non-liquified soil are analyzed. Furthermore, parametric studies are carried out by varying the pile’s configuration, loads, and shape of the structure. This thesis concluded that for piles on liquified soil, soil-pile-structure interaction is an essential design process, however for non-liquified soil those analysis is not necessary. Also, it must be noted that the weight of superstructure has a great impact on the pile’s inertial effect. Although, the dynamic finite difference based coupled analysis of the soil-pile-structure interaction model have the potential to provide accurate results, they are computationally expensive and complex to utilize. Hence, the simplified pseudo-static analysis results are introduced and compared with the dynamic analysis results. In general, there are two (2) different pseudo-static analysis approaches, a displacement-based method, and a force-based method. In conclusion a good agreement is observed between dynamic and specific pseudo-static method analysis.